Chartpak AD colored artist markers. Chartpak brings you its permanent-color AD Marker with 3 distinct line weights in one nib. A single nib with three distinct line weights. These waterproof, permanent, Xylene-based art markers deliver brilliant, sparkling color in fine point, medium weight, or broad strokes, with just a twist of the wrist. AP non-toxic, solvent-based markers do not streak or feather and are ideal for artistic use on traditional and non-traditional surfaces such as paper, acrylics, ceramics, and more! Over 130 colors available. Chartpak artist markers include handy storage case. Chartpak permanent colored markers are made in the USA.